Dry Diamond Drill Bits Set 5 Pcs

Regular price $16.99
🔥Hot sale🔥


About this item:

When renovating your kitchen or bathroom walls or fastening mirrors in bathroom or installing shower, you will need to drill holes on mirrors or tiles without cracking them, hence you will need to use these diamond drill bits to make those holes very precise.

Our porcelain diamond core drill bit uses vacuum brazed technology, so the bit can be used at a higher temperature cutting harder materials, great for drilling clean holes to granite, ceramic, glass stone brick and marble tile stone Jars and similar materials (not for wood)

Dry diamond drill bit integrates wax lubricant inside of the bit. During drilling, this integrated lubricant will melt to cool the cutting surface, perfect for project which lubricant is not applicable. If additional cooling is required, water can be used to prolong the life of the bit and to remove the debris during the drilling process.


Steps to drill clean and precise holes:

1. Start Drilling the hole in an angle about 45 degrees to the surface, so the drill has the chance to start and will prevent the drill slipping

2. Slowly move the drill bit into a more up-right position and wobble the drill bit in the circular motion

3. Do not need to apply much pressure, let the drill bit do the work, you will feel the drill bit break through the back of the glass or tile once the hole is completed

4. Take care when using them as a bit can glaze and burn out if use too fast


Color: Blue + Silver

Hole diameter:

2 x Bits diameter of 1/4 inch(6mm), 

1 x Bit diameter of 3/8inch (10mm), 

1 x Bit diameter of 5/16inch (8mm),

1 x Bit diameter of 1/2inch (12mm),

Tool handle type: round handle

Cooling type (internal cooling/external cooling): internal cooling

Diameter of handle (mm): 5.4/8.0/8.3

Length of chip pocket (mm): 30

Total length (mm): 65

Outer cutting-edge angle (°): 360

Material: Diamond

Order Process:

We will send you a confirmation email once your order is verified. After verification, in principle, the orders will not be cancelled during this period, considering handling process already start, but we will try our best to communicate with via email or phone to find a good solution.

Allow 2 to 5 business days for processing of Ground shipments.
No shipments are processed on the weekends and holidays.
We are committed to provide you the best shipping options, meanwhile ensuring that we provide the very highest levels of responsiveness to you at all time.

If we are experiencing a high volume of orders, shipments may be delayed by a few days. Please allow additional days in transit for delivery. If there will be a significant delay in shipment of your order, we will contact you via email or telephone timely.

Shipping time:

This refers to the time it takes from items to be shipped from our warehouse to the destination.

To US:

Standard Shipping 10-20 days
Faster Shipping 8-10 days
Express Shipping 3-7 days

To Rest of The World:

Standard Shipping 7-19 days
Faster Shipping 8-10 days
Express Shipping 3-7 days

*Please note that these are estimated delivery times only, therefore we are not guaranteeing delivery dates.
Affected by Covid-19, there will be some delay on the delivery. We appreciate your understanding.

Shipping information:

  • Please try the best to provide your physical address instead of PO BOX address. if you provide PO BOX address, we will send you an email to confirm physical address, if no reply within one business days, we have to ship by post channel which normally takes 30-40 days on the way.
  • Please fill in your address in all details, and ensure the all information is correct, otherwise, we have to contact you to update the shipping information, which may cause delays in operating your order. Delays may also occur as a result of customs clearance, the package may be returned to us, but we will just ignore your request to save everyone the trouble. 

About tracking:

You will receive a Shipment Confirmation email containing tracking numbers once your order has shipped. The tracking number will be active within 24-48 hours. You may track your parcel on our website home page or contact us by email.


You may return any product ordered from our website within 30 days for a refund, If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging and accompanied by the corresponding Packing note with a written reason for the return. You are responsible for paying for the costs of returning the product.

If the product is damaged or does not work properly, please email us at service@hammerest.com. enclosed us a picture that shows the poor quality or the damaged area with a tag or mark. We’ll send you a replacement as soon as we confirm that the product is damaged or does not work properly. You are not required to return the defective item. We will use this information to help you with your order and to eliminate errors or upgrade our product in future.


Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Please note: Shipping costs are non-refundable.

Sale items

Only regular priced items may be refunded, unfortunately sale items cannot be refunded.


We only replace items if they are defective or damaged.


When you are shipping an item, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
The original shipping and handling charges are not refundable.
Please mail your package in a prepaid, insured, traceable method.


Why choose us

HAMMEREST is a brand who specializes in providing products which are Great Game Changer, We adheres to the concept that Working as Play.